In the next posts, I'll put here 5 pictures of my room.
This first one, is a close take of my system.
The help I need is this: Is the position correct as the layout of the room is not square?

Thanks in advance.

Pedro Martins

Pedro,

Correct me if I'm wrong, but the only sound absorbing thing I see in that room is the couch?

That's going to be an increadibly bright environment, and you will have a VERY difficult time getting it to sound right. Often times the long decay times of this kind of room show up as a very forward midrange/high frequency response. See if you can't add a throw rug, curtains and maybe some absorbtion behind the speakers. Potted plants in the corners may work well too...